From 17a941d854a3f7b0bb916fdeee4c9ffdcc19d8d3 Mon Sep 17 00:00:00 2001 From: Muli Ben-Yehuda Date: Wed, 11 Jan 2006 22:44:42 +0100 Subject: [PATCH] x86_64: Use function pointers to call DMA mapping functions AK: I hacked Muli's original patch a lot and there were a lot of changes - all bugs are probably to blame on me now. There were also some changes in the fall back behaviour for swiotlb - in particular it doesn't try to use GFP_DMA now anymore. Also all DMA mapping operations use the same core dma_alloc_coherent code with proper fallbacks now. And various other changes and cleanups. Known problems: iommu=force swiotlb=force together breaks needs more testing. This patch cleans up x86_64's DMA mapping dispatching code. Right now we have three possible IOMMU types: AGP GART, swiotlb and nommu, and in the future we will also have Xen's x86_64 swiotlb and other HW IOMMUs for x86_64. In order to support all of them cleanly, this patch: - introduces a struct dma_mapping_ops with function pointers for each of the DMA mapping operations of gart (AMD HW IOMMU), swiotlb (software IOMMU) and nommu (no IOMMU). - gets rid of: if (swiotlb) return swiotlb_xxx(); - PCI_DMA_BUS_IS_PHYS is now checked against the dma_ops being set This makes swiotlb faster by avoiding double copying in some cases. Signed-Off-By: Muli Ben-Yehuda Signed-Off-By: Jon D. Mason Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-x86_64/swiotlb.h | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'include/asm-x86_64/swiotlb.h') diff --git a/include/asm-x86_64/swiotlb.h b/include/asm-x86_64/swiotlb.h index dddf1b21868..60757efd135 100644 --- a/include/asm-x86_64/swiotlb.h +++ b/include/asm-x86_64/swiotlb.h @@ -3,10 +3,14 @@ #include +#include + /* SWIOTLB interface */ -extern dma_addr_t swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, - int dir); +extern dma_addr_t swiotlb_map_single(struct device *hwdev, void *ptr, + size_t size, int dir); +extern void *swiotlb_alloc_coherent(struct device *hwdev, size_t size, + dma_addr_t *dma_handle, gfp_t flags); extern void swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr, size_t size, int dir); extern void swiotlb_sync_single_for_cpu(struct device *hwdev, @@ -34,10 +38,10 @@ extern int swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, extern void swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction); extern int swiotlb_dma_mapping_error(dma_addr_t dma_addr); -extern void *swiotlb_alloc_coherent (struct device *hwdev, size_t size, - dma_addr_t *dma_handle, gfp_t flags); extern void swiotlb_free_coherent (struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle); +extern int swiotlb_dma_supported(struct device *hwdev, u64 mask); +extern void swiotlb_init(void); #ifdef CONFIG_SWIOTLB extern int swiotlb; @@ -45,4 +49,6 @@ extern int swiotlb; #define swiotlb 0 #endif -#endif +extern void pci_swiotlb_init(void); + +#endif /* _ASM_SWTIOLB_H */ -- cgit v1.2.3